Trophy 900 revving hi and low on tickover

Sound like its searching for fuel.Check for any blocks/kinks in pipes, and splits (again) and make sure its all sealed up on the carbs and airbox. If i remember(but i might be wrong) does the fuel tap have a small mesh filter in, if so check and clean. I seem to be coming across a lot of bikes, mostly carbed, that seem to be having a running problems?? same with a bandit i have, and im wondering if they have added something to the fuel AGAIN, as most cars and bike now are injection and iv not heard anything with them.

Just a thought

 

usually if it is the crank sensor the symptoms are the bike cutting completely out. Then after a few mins when the sensor cools a little, the bike fires ok. My sprint used to be really lumpy like yours tho it didnt rev as high as yours on tickover but it did drop very low and stall a lot. I had all the pipes replaced and new coils/leads fitted and it has been fine since. Oh I had an air filter too as my old one appeared to have a birds or sommats nest inside it.

 

it was always worse during a run, seemed much better when the lump was colder. I used to have to turn the tickover up a bit so it wouldnt stall,still have mine set at about 1200 revs now coz to me its too slow at 8-900. I also had issues with my old throttle cable which seemed too short, the revs changed when you turned the bars,new cable and rerouting cured that.


have you checked for air leak on carb rubbers?? have you run fuel system cleaner through,if it is only on lower revs it sounds like maybe blocked pilot jets but I am no expert. having said that you did say you had found a leccy problem on no 3 cylinder,you will obviously have to fix this anyway

 

Ok where to start.

Firstly these bikes need to be maintained properly as they are getting a bit old.

Pilot jets need to be checked and carbs most probably need a good clean out.

Also make sure your coils are working alright as they are known to go wrong.

Would also be worthwhile getting the valve clearances checked as the exhaust valves close up after time.

Cheers

Steve